GameTrailers has a video walkthrough of Alpha Protocol up, showing the E3 level with an Obsidian developer doing some commentary. I think it would have looked better had they used the magic of editing and good marketing to show how different paths would play out in different ways; play a comparative to really drive that point home. Maybe even show the pre-mission equipment choices and how a different character archetype would have a different loadout. As it stands now, Obsidian isn't exactly showing their best stuff, displaying what looks to be...well...Mass Effect but not in space.

Also it's likely "old", but it's new to me, and I'm sure some others might be interested.
Spotted at: Gamebanshee